Share-Based Compensation (Schedule Of Restricted Stock Unit Activity) (Details) shares in Thousands	12 Months Ended
	Dec. 31, 2022 $ / shares shares
Restricted stock units (RSU's)
Number of Units
Nonvested, at beginning of year (in shares)	165
Granted (in shares)	59
Vested (in shares)	(66)
Forfeited (in shares)	(10)
Nonvested, at end of year (in shares)	148
Weighted Average Grant-Date Fair Value
Weighted average grant date fair value, at beginning of year (in USD per share) | $ / shares	$ 306.18
Weighted average grant date fair value, end of year (in USD per share) | $ / shares	$ 391.55
Restricted stock units expected to vest reduced for estimated forfeitures
Number of Units
Nonvested, at end of year (in shares)	141
Weighted Average Grant-Date Fair Value
Weighted average grant date fair value, end of year (in USD per share) | $ / shares	$ 389.24